National Geographic 18L Waterproof Backpack National Geographic 18L Backpack Made of 100% recycled polyester fabric, waterproof material.- 2 side pockets - Chest strap - Jacket strap - Perfect organization in the main compartment - Integrated rain cover - Special compartment for a drinking bottle Volume: 18 liters Weight: 450 g Dimensions: 24 x 42 x 16.5 cm (W x H x D) Material: 100% recycled polyester